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Journal of Cell Science, Vol 93, 565-570, Copyright © 1989 by Company of Biologists

Submitted on January 3, 1989
Accepted on March 7, 1989

The shape of mitochondria and the number of mitochondrial nucleoids during the cell cycle of Euglena gracilis

YASUKO HAYASHI 1 and KATSUMI UEDA 1

1 Biological Laboratory, Nara Women's University, 630 Nara, Japan

Author for correspondence

The shape of mitochondria and the number of mitochondrial nucleoids in Euglena cells were examined throughout the cell cycle by fluorescence microscopy. Both photoheterotrophic and heterotrophic cells contained a network of mitochondria that did not divide into fragments at any stage of the cell cycle. Mitochondrial nucleoids could be clearly detected in the mitochondria by staining with ethidium bromide and with DAPI. Half of the mitochondrial nucleoids entered each daughter cell during cytokinesis. Nucleoids in the newly produced daughter cells increased in number as the cells increased in size. The number of nucleoids reached double the initial value in cells at the stage just prior to mitosis. The total length of the mitochondrial net was proportional to the cell volume.

Key words: cell cycle, Euglena, fluorescence microscopy, mitochondria, mitochondrial nucleoid

Submitted on January 3, 1989
Accepted on March 7, 1989




This article has been cited by other articles:


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Y Hayashi-Isimaru, K Ueda, and M Nonaka
Detection of DNA in the nucleoids of chloroplasts and mitochondria in Euglena gracilis by immunoelectron microscopy
J. Cell Sci., January 8, 1993; 105(4): 1159 - 1164.
[Abstract] [PDF]


© The Company of Biologists Ltd 1989